Steps to reproduce:

1. Go to Host->Triggers or Trigger prototypes (also Templates->Triggers, trigger prototypes)
2. Select some triggers and press Mass update
3. Select "Replace dependencies"
4. Add trigger of template and press update to get error "Cannot add dependency from a host to a template."
5. Again press Add trigger and choose trigger in popup

Result:
Redirected to Triggers page
Expected:
Should be mass update page with selected trigger